Quite a few summers we have spent time at Black Butte, OR, close to Sisters. Hwy 20 up to the D. Wright observatory, the lava fields, etc is my favorite bicycle ride ever, anywhere! Have just never had the opportunity to take bicycle and motorcycle on the same vacation.
It is so easy to find empty stretches of Oregon asphalt to go blasting down. Watch out for wildlife!
Other points of interest in the neighborhood
Pilot Butte in Bend
Head of the Metolius River
It's all good